body {
    background-image: linear-gradient(to left, #9c88ff, #3cadeb);
    display: flex;
    justify-content: center;
}

.box {
    position: relative;
    top: 100px;
    width: 1180px;
    height: 550px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, .8);
    display: flex;
}

.img {
    width: 800px;
    height: 550px;
    background-image: url("../img/3.jpg");
    background-size: cover;
    text-align: center;
}